81
TROUBLE SHOOTING
4-2-13) When Water Tank Heater does not operate
Start
MAIN PBA is normal.
-- Check other parts.
Check Water Tank Heater Wire.
Check if the Heater is open.
Do Forced Operation and
check it again with Comp on.
NO
Replace Main PBA
(Micom or IC72 defect)
NO
Replace SSR72
NO
If it is 0 , Check if Heater is broken.
If it is
, Check if wire is broken.
If it is abnormal resistance, replace
Heater.
NO
YES
YES
YES
YES
YES
Comp is operating.
the voltage at IC72 #12
is about 0V
The voltage across
CN70 #3 & CN72 #3 is about AC 230V
(or 115V)
Resistance between CN72
#3 & CN70 #3 is about 3.6k (AC 115V) or
13k (AC 230V)
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